import sys, os, re, shutil

if __name__ == "__main__":

print("Python utility to transform the JavaScript Parser and Lexer grammars to work with a python output")

if len(sys.argv) == 1:

print(f"""Please run this script as {sys.argv[0]} <grammar>.g4""")

sys.exit(0)

file_path = sys.argv[1]

if not os.path.exists(file_path):

print(f"Could not find file: {file_path}")

sys.exit(1)

parts = os.path.split(file_path)

file_name = parts[-1]

if file_name.lower() not in ["javascriptparser.g4", "javascriptlexer.g4"]:

print("Could not determine which grammar you have specified, please specify either the Paarser or the Lexer")

sys.exit(1)

shutil.move(file_path, file_path + ".bak")

input_file = open(file_path + ".bak",'r')

output_file = open(file_path, 'w')

if file_name.lower() == "javascriptparser.g4":

for x in input_file:

if 'this.' in x:

x = x.replace('this.', 'self.')

output_file.write(x)

output_file.flush()

elif file_name.lower() == "javascriptlexer.g4":

for x in input_file:

if '!this.IsStrictMode' in x:

x = x.replace('!this.Is', 'not self.is')

if 'this.Is' in x:

x = x.replace('this.Is', 'self.is')

if 'this.ProcessOpenBrace();' in x:

x = x.replace('this.ProcessOpenBrace();', 'self.processOpenBrace()')

if 'this.ProcessCloseBrace();' in x:

x = x.replace('this.ProcessCloseBrace();', 'self.processCloseBrace()')

if 'this.ProcessStringLiteral();' in x:

x = x.replace('this.ProcessStringLiteral();', 'self.processStringLiteral()')

output_file.write(x)

output_file.flush()

input_file.close()

output_file.close()